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Quantum Computer

01 /Quantum Computers 02 /How to build a qubit 03 /Spin qubits (beginner level) 04 /Operations on spin qubits (beginner level) 05 /Electron spin qubits 06 /Capturing a single electron 07 /Quantum dot qubits 08 /Quantum control and readout 09 /Qubit errors 10 /NV center qubits 11 /Operations on NV center qubits 12 /The Transmon Qubit - A basis for the Quantum Computer 13 /Operations on the Transmon Qubit - Circuit QED 14 /Single-qubit operations on the Transmon qubit 15 /Measurements on the Transmon Qubit 16 /Two-qubit operations on the Transmon qubit 17 /Topological qubits: Anyons 18 /Operations on anyons: Braiding 19 /Operations on anyons: Real-life experiments 20 /Topological quantum computing: Majorana fermions and where to find them 21 /Majorana bound states in superconductors 22 /How do you measure Majorana bound states? 23 /A framework for the future Quantum Computer 24 /The Building Blocks of a Quantum Computer 25 /How to build a Quantum Algorithm - Quantum Circuits 26 /How do you program a quantum algorithm? 27 /The compiler of a quantum computer 28 /Micro-architectures 29 /How do we connect our quantum system to a classical interface? 30 /Assembling a Quantum Processor 31 /Microwave drivers for qubits 32 /Implementation of microwave drivers 33 /Quantum error correction 34 /Surface codes 35 /Fault-tolerant Quantum Error Correction with surface codes

Operations on spin qubits (beginner level)

Classical computers work using chips that consist of millions of transistors. You may already know that the concept of spin qubits is based on these transistors, which makes it easy to envision a similar picture of millions of quantum bits on a single chip. 

But okay, suppose we can put many spin qubits on a single chip, what could we do with it? Team leader and roadmap leader at QuTech Menno Veldhorst will tell you all about the basic operations on such qubits in this video. Specifically on how they can be initialized and read-out, and how we can control such qubits (meaning how we can manipulate their states). As well as how the coupling between two qubits allows us to execute two-qubit logic gates, which is an essential building block for a multitude of quantum applications.

Prerequisite knowledge

Further Thinking 

We have seen that in order to have a qubit in a quantum dot 2 magnetic fields are needed. One of these is perpendicular to the plane (applied magnetic field), whereas the other one is on it (alternating magnetic field). Can you tell why each of them is needed?

Solution

Further reading 

Take a look at this review paper discussing the field of spins in quantum dots.

For more recent research, you might want to check out these papers:

In the paper by Watson et al. (2018), they show the experimental realisation of two quantum algorithms with a two spin qubits quantum processor.